1 c 表示从属关系的，of后面用名词性的无助代词或是人物的's形式
2 b 表示一种假设，除非你立即把这些书归还给图书馆，否则要缴纳罚金。
3 d let's是缩写形式时，反义疑问句要用shall we ?
4 a 前面用了was,是过去时，是因为这几周一直在下雨，用过去完成进行时...
请帮做选择题1． Don’t you know he is an old friend of _______?a. my
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